Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cornell finds deadly fish virus in the Northeast is spreading to other species

21.07.2006
Cornell researchers have found that a deadly fish virus detected in the northeastern United States for the first time in June in two species has probably spread to at least two more. But they have yet to determine whether the virus is responsible for the death of hundreds of fish in Lake Ontario and the St. Lawrence River in recent weeks.

Paul Bowser, Cornell professor of aquatic animal medicine, holds a muskellunge found dead in the northeastern waters. The fish is one of many undergoing tests at Cornell to detect a deadly viral hemorrhagic septicemia virus (VHSV) spreading in the Great Lakes.

Over the past month, Cornell's Aquatic Animal Health Program at the College of Veterinary Medicine has been sent some 300 fish for evaluation. The frozen samples are from the fish that have been dying since late May and early June in Lake Erie, Lake Ontario and the St. Lawrence River. Last week, an estimated 1,000 dead fish washed up on the shores of Lake Ontario in just one morning.

Viral hemorrhagic septicemia virus (VHSV) was detected and confirmed for the first time in the Northeast in round gobies and muskellunge in June. Cornell researchers are awaiting finals results of tests on 54 fish of 10 species that indicated VHSV in smallmouth bass and burbot. To date, Cornell researchers also have tested for the virus in lake sturgeon, brown bullhead, rock bass, yellow perch, pumpkinseed and black crappie.

VHSV causes fatal anemia and hemorrhaging in many fish species but poses no threat to humans or other animals.

"The situation right now is that we still have fish dying in Lake Ontario," said Geoffrey Groocock, a postdoctoral associate at Cornell's Aquatic Animal Health Program.

"We have detected the virus in other fish species in the region, which may be contributing to the continuing fish mortalities. We are continuing to test samples as we receive them from the New York State Department of Environmental Conservation (DEC) and State University of New York College of Environmental Science and Forestry Thousand Island Biological Field Station to try and get a clearer picture."

The researchers are using a classical cell culture technique to perform the initial stage of the diagnostic testing. This technique can take two to four weeks to yield results. Cornell researchers are developing a molecular-based test for VHSV based on a specific gene sequence in the virus. Once available, the new technique will cut the turnaround for confirmation to three to five days.

Groocock said the high number of dead fish reported recently may be due to the increased presence of vacationers on the lakes in summer, as well as the increased awareness since reports of mortalities earlier in the season. Also, recent storms and heavy winds may have washed up more fish from deeper waters. Groocock added that while more species of fish are dying, absolute numbers of fish mortalities do not appear to be changing.

"There is no cure for VHSV in fish in an ecosystem as large as the Great Lakes Basin. Given this, it is likely that management practices designed to limit the spread of the virus will be put in place," said Groocock.

Although no management decisions have yet been made, the DEC could recommend that boaters clean their boats before traveling from one body of water to another and not dump bait minnows into open water after a day of fishing.

VHSV was first reported in 1988 in the United States in spawning salmon in the Pacific Northwest. It was reported in North American freshwater fish in 2005 in muskellunge in Lake St. Claire, Mich., and in freshwater drum from the Bay of Quinte, Lake Ontario, Canada.

Sabina Lee | EurekAlert!
Further information:
http://www.cornell.edu

More articles from Ecology, The Environment and Conservation:

nachricht Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen

nachricht A new indicator for marine ecosystem changes: the diatom/dinoflagellate index
21.08.2017 | Leibniz-Institut für Ostseeforschung Warnemünde

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Rainbow colors reveal cell history: Uncovering β-cell heterogeneity

22.09.2017 | Life Sciences

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>